C - Chemistry – Metallurgy – 01 – F
Patent
C - Chemistry, Metallurgy
01
F
C01F 11/18 (2006.01) C09C 1/02 (2006.01)
Patent
CA 2268614
The invention concerns precipitated calcium carbonate products containing polynuclear regular agglomerates having a number of calcium carbonate particles (aggregates) attached to each other and having a particle size of about 40 to 200 nm. According to the invention, these products are prepared by adjusting the Z potential of the calcium carbonate suspension to -1...-20 mV by adjusting the pH of the suspension to 6.5...9.5. The pH of the calcium carbonate slurry obtained by causticizing is adjusted to a desired value in a box filter, where after the suspension is stirred by a heavy-duty mixer such that it is subjected to differences of about 50 to 200 m/s in peripheral speed. The products according to the invention have good opacity and are very well suited for coating paper.
L'invention concerne des produits au carbonate de calcium précipité, contenant des agglomérats polynucléaires réguliers comprenant un nombre de particules de carbonate de calcium ( agrégats) fixées les unes aux autres et présentant une taille d'environ 40 à 200 nm. On prépare ces produits, selon le procédé de l'invention, en ajustant le potentiel Z de la suspension de carbonate de calcium à -1...-20 mV en ajustant le pH de la suspension à 6,5...9,5. On ajuste à une certaine valeur le pH de la boue de carbonate de calcium obtenue par caustification dans un filtre, après quoi la suspension est agitée par un mélangeur de grande puissance de sorte qu'elle soit soumise à des différences de vitesse périphérique d'environ 50 à 200 m/s. Les produits de l'invention présentent une bonne opacité et conviennent particulièrement au couchage du papier.
Fp-Pigments Oy
Gowling Lafleur Henderson Llp
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